Combining characters in Unicode are composed of two adjacent Unicode code units but occupy a single position on the screen. The second code unit of these pairs needs to be treated as a zero-width character so that cursor positioning matches displayed text properly.
Chinese, Japanese and Korean (CJK) characters will typically occupy two screen positions although they are encoded as a single Unicode code unit. These characters need to be treated as double-width characters so that cursor position matches displayed text properly.
Open mongo shell.
Insert multi-byte sequence as a find document such as:
Move the cursor to a few characters before the terminating quotation and hit backspace.
The terminating quotation will disappear.